"IMSCREWS 1/2 x 3-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (5 pcs)

Extreme Strength for Structural Timber Joints
When projects demand industrial-grade holding power, these 1/2 diameter bolts deliver. Perfect for heavy-duty timber framing, mounting large deck ledgers, or securing structural steel to 4x4 or 6x6 posts. The 3.5-inch length provides the depth required for massive load-bearing connections.

Vise-Like Clamping Power
Our partially threaded shank allows the bolt to spin freely in the outer board, drawing timber members together into a gap-free, rock-solid joint. This eliminates the bridging effect common in long full-thread screws, ensuring a stable connection that won't loosen under stress or high vibration.

304 Stainless Exterior Defense
Forged from premium 18-8 (304) Stainless Steel for ultimate weather resistance. compatible with ACQ pressure-treated lumber, preventing structural decay and unsightly rust streaks on high-value cedar, redwood, or deck framing.

Technical FAQ
¡ñ Tools Required: Fits a standard 3/4 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this massive diameter. Use a 5/16 bit for softwoods or 3/8 bit for hardwoods to prevent splitting.
¡ñ Why 3.5 length? Ideal for passing through 1.5 or 2 timber with a deep 1.5 + thread anchor in the support post.
¡ñ Resilience: Rated for marine, coastal, and high-humidity environments.

Specifications:
- Size: 1/2 x 3-1/2
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel (18-8)
- Drive: 3/4 Hex Head
- Qty: 5 pcs"

Key Features

• EXTREME LOAD BEARING The massive 1/2-inch diameter provides industrial-grade shear strength. Specifically designed for securing heavy-duty dock cleats, post bases, and main structural beams.
• OPTIMIZED CLAMPING FORCE Featuring a partially threaded design that allows the smooth shank to pass through the outer board, drawing thick timber pieces together with bolt-level pull.
• 304 CORROSION DEFENSE Forged from premium 304 (18-8) stainless steel to prevent rust deep within timber cores. Compatible with ACQ pressure-treated lumber for high-moisture exterior use.
• INDUSTRIAL DRIVE INTERFACE Built with an oversized hex head for 3/4 power sockets. Designed to handle the extreme torque required for deep 3-1/2 inch structural penetrations.
• MANDATORY TECHNICAL GUIDELINE To prevent catastrophic timber splitting with this massive 1/2 bolt, pre-drilling a pilot hole (5/16 for softwoods, 11/32 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21DZJ8K
• Internal SKU: IMS0703
• Size: 1/2" x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5